What is an alternative to sea walls that will save our beaches and save our homes at the same time? Why do we build up sea walls instead of attempting to find an alternative that is better for our environment?

>seawalls cause a reduction of sand as they interfere with natural sand processes. Here’s how this works.
>The friction angle or the angle of response for a very loose sand is 25deg. As you see on a natural foreshore , there is a slight angle (of about 15-25deg) which extends up from the water towards the land
>This is due to the ocean washing in sediment (in this case sand) and depositing on the existing sand
>As the shoreline gets higher the water can no longer push its way up the beach due to the slope
>As a result, the water appears to 'recede' and the beach width increases (ocean retreats).
>If you place a hard structure at the end of the oceans deposition path you create a reflective effect
>Instead of the ocean depositing sand, a 'backwash effect' is created and the sand is taken back towards the ocean in the backwash >This means sand no longer deposits as far up the beach, or even on the beach at all, thus reducing overall width of the beach
>Moreover, sand dunes will be destroyed / unable to replenish due to the shape of a hard structure
>Sand dunes form from deposition of sand via wind
>If you create a hard structure that is not at a suitable angle (>25deg) which is ineffective for protecting the homes, any sand blown onto the structure will eventually be blown off as it becomes difficult for the sand to form a mass. >As a result dunes dissipate and eventually disappear
>sand replenishment is an ineffective response to the effects that occur as a result of a seawall
>Any sand replenishment will be eroded away and again result in no beach.